Some tests (Was: Probable bug in handling disabled network interfaces (2.2.12))

Mr. James W. Laferriere (babydr@baby-dragons.com)
Sun, 19 Sep 1999 15:58:34 -0700 (PDT)

Messages sorted by: [ date ][ thread ][ subject ][ author ]
Next message: Michael Harnois: "Re: Linux 2.3.18ac6"
Previous message: David Weinehall: "arch/xxx/config.in"
In reply to: Mr. James W. Laferriere: "Re: Probable bug in handling disabled network interfaces (2.2.12)"

Hello Alexey, find below some tests I ran on a 2.2.12 +
alan-9 system . They show that one (if using 'ifconfig' to down
an interface) should follow this sequence :

ifconfig eth? 0.0.0.0
ifconfig eth? down

Hello All, Here you go

/sbin/ifconfig eth1 > alexey.tests

eth1 Link encap:Ethernet HWaddr 00:80:5F:D4:25:1F
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:9 Base address:0x7000

/sbin/ifconfig eth1 192.168.0.51
/sbin/ifconfig eth1 >> alexey.tests

eth1 Link encap:Ethernet HWaddr 00:80:5F:D4:25:1F
inet addr:192.168.0.51 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2 errors:0 dropped:0 overruns:0 frame:0
TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:9 Base address:0x7000

/sbin/ifconfig eth1 0.0.0.0
/sbin/ifconfig eth1 >> alexey.tests

eth1 Link encap:Ethernet HWaddr 00:80:5F:D4:25:1F
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5 errors:0 dropped:0 overruns:0 frame:0
TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:9 Base address:0x7000

/sbin/ifconfig eth1:?rap 10.10.10.10
/sbin/ifconfig eth1 >> alexey.tests

eth1:?rap Link encap:Ethernet HWaddr 00:80:5F:D4:25:1F
inet addr:10.10.10.10 Bcast:10.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:9 Base address:0x7000

/sbin/ifconfig eth1:?rap down
/sbin/ifconfig eth1 >> alexey.tests

eth1 Link encap:Ethernet HWaddr 00:80:5F:D4:25:1F
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:6 errors:0 dropped:0 overruns:0 frame:0
TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:9 Base address:0x7000

As you can see from the below eth1 is still receiving packets
And if this is not considered UP I do not know what is .

eth1 Link encap:Ethernet HWaddr 00:80:5F:D4:25:1F
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:9 Base address:0x7000

/sbin/ifconfig eth1 down
/sbin/ifconfig eth1 >> alexey.tests

eth1 Link encap:Ethernet HWaddr 00:80:5F:D4:25:1F
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:18 errors:0 dropped:0 overruns:0 frame:0
TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:9 Base address:0x7000

OK, After doing a DOWN will wait a few minutes again & see if the
interface receives any packets .

Wow, that one works . Ok Now I'm going to try just the
'ifconfig eth1 down' , without using the 'ifconfig eth1 0.0.0.0' .

ifconfig eth1 192.168.0.51
ifconfig eth1 >> alexey.tests

eth1 Link encap:Ethernet HWaddr 00:80:5F:D4:25:1F
inet addr:192.168.0.51 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:19 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:9 Base address:0x7000

Just to prove that we are recieving traffic on this interface .

eth1 Link encap:Ethernet HWaddr 00:80:5F:D4:25:1F
inet addr:192.168.0.51 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:23 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:9 Base address:0x7000

ifconfig eth1 down , ...
ifconfig eth1 , ...

eth1 Link encap:Ethernet HWaddr 00:80:5F:D4:25:1F
inet addr:192.168.0.51 Bcast:192.168.0.255 Mask:255.255.255.0
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:24 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:9 Base address:0x7000

ping 192.168.0.51

PING 192.168.0.51 (192.168.0.51): 56 data bytes
64 bytes from 192.168.0.51: icmp_seq=0 ttl=255 time=0.4 ms
64 bytes from 192.168.0.51: icmp_seq=1 ttl=255 time=0.2 ms
64 bytes from 192.168.0.51: icmp_seq=2 ttl=255 time=0.2 ms

--- 192.168.0.51 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 0.2/0.2/0.4 ms

traceroute 192.168.0.51

traceroute to 192.168.0.51 (192.168.0.51), 30 hops max, 40 byte packets
1 cp1500r1.baby-dragons.com (192.168.0.51) 0.603 ms 0.219 ms 0.182 ms

Hmmm, somebody is still responding to traffic from this host .
OK, lets try it from another host .

gated:/usr/src/linux# ping 192.168.0.51
PING 192.168.0.51 (192.168.0.51): 56 data bytes
64 bytes from 192.168.0.51: icmp_seq=0 ttl=255 time=1.0 ms
64 bytes from 192.168.0.51: icmp_seq=1 ttl=255 time=0.3 ms
64 bytes from 192.168.0.51: icmp_seq=2 ttl=255 time=0.3 ms
64 bytes from 192.168.0.51: icmp_seq=3 ttl=255 time=0.3 ms

--- 192.168.0.51 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 0.3/0.4/1.0 ms

Ouch we have a problem here . !!!
Now if we set eth1 to 0.0.0.0 then eth1 is again truly down .

/sbin/ifconfig eth1 0.0.0.0

gated:/usr/src/linux# ping -c3 192.168.0.51
PING 192.168.0.51 (192.168.0.51): 56 data bytes

--- 192.168.0.51 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

Next message: Michael Harnois: "Re: Linux 2.3.18ac6"
Previous message: David Weinehall: "arch/xxx/config.in"
In reply to: Mr. James W. Laferriere: "Re: Probable bug in handling disabled network interfaces (2.2.12)"